A laser ion source (LIS) can easily provide a high current beam. However, it has been
difficult to obtain a longer beam pulse while keeping a high current. On occasion, longer
beam pulses are required by certain applications. For example, more than 10 μ s of beam
pulse is required for injecting highly charged beams to a large sized synchrotron. To extend
beam pulse width, a solenoid field was applied at the drift space of the LIS at Brookhaven
National Laboratory. The solenoid field suppressed the diverging angle of the expanding …